A high-purity anhydrous alcohol production system and a method for producing high-purity anhydrous alcohol

Abstract

The invention discloses a high-purity anhydrous alcohol production system, including a raw material tank, a four-effect light-removing tower, a first-effect distillation tower, a second-effect distillation tower, a third-effect distillation tower, an adsorption device and an evaporation recovery tower; the raw material tank is connected to the middle inlet end of the four-effect light-removing tower; the top alcohol vapor outlet end of the four-effect light-removing tower is connected to the inlet end of the light-removing tower condenser; the bottom alcohol outlet end of the four-effect light-removing tower is connected to the middle and lower inlet end of the three-effect distillation tower; the bottom outlet end of the three-effect distillation tower is connected to the middle and lower inlet end of the two-effect distillation tower; the bottom alcohol outlet end of the two-effect distillation tower is connected to the middle and lower inlet end of the first-effect distillation tower; the top alcohol vapor outlet end of the first-effect distillation tower is connected to the inlet end of the reboiler of the two-effect distillation tower; the top alcohol vapor outlet end of the two-effect distillation tower is connected to the inlet end of the reboiler of the three-effect distillation tower; the top alcohol vapor outlet end of the three-effect distillation tower is connected to the inlet end of the reboiler of the four-effect light-removing tower. The present invention has low production cost, and the steam consumption per ton of anhydrous alcohol produced does not exceed 0.5 tons.

Description

Technical Field

[0001] The invention relates to the technical field of high-purity anhydrous ethanol production, and in particular to a high-purity anhydrous ethanol production system and a method for producing the high-purity anhydrous ethanol. Background Art

[0002] Since the national standard for fuel ethanol does not have high requirements for the content of impurities, the domestically produced fuel ethanol, in addition to ethanol as the main component, contains impurities such as methanol, aldehydes and fusel oil generated during the production process, and the water content of fuel ethanol is generally around 0.5%. High-purity anhydrous alcohol has relatively high requirements for the content of impurities, and the water content is generally required to be below 0.1%. Therefore, fuel ethanol cannot be used as high-purity anhydrous alcohol and must be purified and further dehydrated to meet the requirements of high-purity anhydrous alcohol.

[0003] At present, the price of anhydrous alcohol in China is more than 1,000 yuan higher than that of fuel ethanol, while the cost of producing high-purity anhydrous alcohol from fuel ethanol is no more than 200 yuan per ton. Therefore, the production of high-purity anhydrous alcohol from fuel ethanol has high economic benefits. At present, there are no reports on the process and equipment for producing high-purity anhydrous alcohol from fuel ethanol at home and abroad. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a high-purity anhydrous alcohol production system and a method for producing high-purity anhydrous alcohol.

[0005] To achieve the above object, the present invention adopts the following technical solution:

[0006] In a first aspect of the present invention, a high-purity anhydrous alcohol production system is provided, comprising a raw material tank, a four-effect light removal tower, a first-effect distillation tower, a second-effect distillation tower, a third-effect distillation tower, an adsorption device and an evaporation recovery tower; the raw material tank is connected to the middle inlet end of the four-effect light removal tower through a pipeline via a raw material preheater, the alcohol vapor outlet end at the top of the four-effect light removal tower is connected to the inlet end of the light removal tower condenser through a pipeline, the alcohol vapor outlet end at the bottom of the four-effect light removal tower is connected to the middle and lower inlet end of the three-effect distillation tower through a pipeline, and the alcohol vapor outlet end at the top of the three-effect distillation tower passes through a light removal reboiler through a pipeline and is respectively connected to the top inlet end of the three-effect distillation tower and the top inlet end of the evaporation recovery tower through pipelines;

[0007] The alcohol outlet at the bottom of the three-effect distillation tower is connected to the middle and lower inlet of the two-effect distillation tower through a pipeline, and the alcohol vapor outlet at the top of the two-effect distillation tower passes through a three-effect reboiler through a pipeline and is connected to the top inlet of the two-effect distillation tower and the top inlet of the evaporation recovery tower through pipelines respectively;

[0008] The alcohol outlet at the bottom of the second-effect distillation tower is connected to the middle and lower inlet of the first-effect distillation tower through a pipeline, and the alcohol vapor outlet at the top of the first-effect distillation tower passes through a second-effect reboiler through a pipeline and is connected to the top inlet of the first-effect distillation tower and the top inlet of the evaporation recovery tower through pipelines respectively;

[0009] A distilled alcohol preheater is arranged at the top inlet of the evaporation recovery tower; the alcohol vapor outlet of the evaporation recovery tower is connected to the inlet of the adsorption equipment through a pipeline through the preheater, and the anhydrous alcohol vapor outlet of the adsorption equipment is connected to the finished product cooler through a pipeline in sequence through a first-effect reboiler and a raw material preheater.

[0010] Preferably, the outlet end of the light removal tower condenser is connected to the top inlet end of the four-effect light removal tower and the head storage tank through pipelines, and the light removal tower condenser is also connected to the first vacuum pump through pipelines. Fuel ethanol with a water content of 0.5% is placed in the raw material tank, and negative pressure is provided to the four-effect light removal tower through the first vacuum pump.

[0011] Preferably, the light-removal reboiler forms a closed loop with the four-effect light-removal tower through a pipeline, the three-effect reboiler forms a closed loop with the three-effect distillation tower through a pipeline, the two-effect reboiler forms a closed loop with the two-effect distillation tower through a pipeline, and the one-effect reboiler forms a closed loop with the one-effect distillation tower through a pipeline.

[0012] Preferably, the decomposition outlet of the adsorption device is connected to the lower inlet of the evaporation recovery tower through a pipeline in sequence via a decomposition condenser and a light alcohol preheater, and the decomposition condenser is connected to a second vacuum pump through a pipeline. The light alcohol decomposed by the adsorption device is recycled, and a negative pressure is provided for the decomposition process of the adsorption device through the second vacuum pump.

[0013] Preferably, the adsorption device includes molecular sieve adsorber A, molecular sieve adsorber B and molecular sieve adsorber C. The adsorber uses three molecular sieve adsorbers, one for adsorption, one for pressurization and one for analysis, and the pressure fluctuation is very small during switching, thereby ensuring the stable operation of the device.

[0014] Preferably, the waste liquid outlet at the bottom of the evaporation recovery tower is connected to the wastewater treatment system through a pipeline via a light alcohol preheater. The wastewater from the evaporation recovery tower kettle is used to preheat the light alcohol through the light alcohol preheater.

[0015] Preferably, the bottom of the evaporation recovery tower forms a closed loop with the evaporation reboiler through a pipeline, the inlet ends of the evaporation reboiler and the superheater are respectively connected to saturated steam through pipelines, and the outlet ends of the evaporation reboiler and the superheater are respectively connected to the boiler room through pipelines in sequence through a condensate tank and a distilled alcohol preheater. The distilled alcohol preheater preheats the evaporation recovery tower feed with steam condensate.

[0016] Preferably, the bottom outlet of the first-effect distillation tower is connected to the fusel oil collection tank through a pipeline. Fusel oil is discharged from the bottom of the first-effect distillation tower.

[0017] A second aspect of the present invention provides a method for producing high-purity anhydrous alcohol using the above system, comprising the following steps:

[0018] (1) The fuel ethanol raw material with a water content of 0.5% is first preheated to 60°C in a raw material preheater and then enters the middle of a four-effect de-lightening tower. The impurities such as low-boiling point methanol and aldehydes contained in the fuel ethanol are removed by a de-lightening tower. The alcohol vapor at the top of the de-lightening tower is condensed in a de-lightening tower condenser and most of it is refluxed, and a small amount of head is collected;

[0019] (2) the alcohol from which low-boiling impurities have been removed enters the lower middle part of the triple-effect distillation tower from the bottom of the quadruple-effect light-removal tower for distillation, and the alcohol vapor at the top of the triple-effect distillation tower is condensed through a light-removal reboiler, and is used as a heat source for the quadruple-effect light-removal tower while being condensed. A portion of the condensate is refluxed to the top of the triple-effect distillation tower, and a portion is extracted as distilled alcohol;

[0020] (3) The alcohol at the bottom of the three-effect distillation tower enters the lower middle part of the two-effect distillation tower for distillation. The alcohol vapor at the top of the two-effect distillation tower is condensed through a three-effect reboiler and used as a heat source for the three-effect distillation tower. Part of the condensate flows back to the top of the two-effect distillation tower, and part is extracted as distilled alcohol.

[0021] (4) The alcohol at the bottom of the second-effect distillation tower enters the lower middle part of the first-effect distillation tower for distillation. The alcohol vapor at the top of the first-effect distillation tower is condensed through the second-effect reboiler and used as a heat source for the second-effect distillation tower. Part of the condensate flows back to the top of the first-effect distillation tower, and part is extracted as distilled alcohol.

[0022] (5) The distilled alcohol extracted from the first-effect distillation tower, the second-effect distillation tower, and the third-effect distillation tower is preheated to 115° C. in a distilled alcohol preheater and then enters an evaporation recovery tower. It is then concentrated and vaporized together with the recovered light alcohol and then enters a superheater for overheating. It is then dehydrated by an adsorption device. The dehydrated anhydrous alcohol vapor enters a first-effect reboiler for condensation. The condensation also serves as a heat source for the first-effect distillation tower. The anhydrous ethanol obtained after condensation is used to preheat the raw material and then cooled in a finished product cooler to obtain a finished product of high-purity anhydrous ethanol.

[0023] (6) The adsorption equipment is subjected to negative pressure analysis, and the light alcohol vapor generated by the analysis enters the analysis condenser. The condensed light alcohol is preheated by the light alcohol preheater and then enters the lower part of the first-effect evaporation recovery tower for alcohol recovery.

[0024] Preferably, the top temperature of the four-effect light-removal tower is 50-53°C, the bottom temperature is 56-59°C, and the absolute pressure of the four-effect light-removal tower is 32-36 kPa;

[0025] Preferably, the top temperature of the triple-effect distillation tower is 65-68°C, the bottom temperature is 70-72°C, and the absolute pressure of the triple-effect distillation tower is 62-66 kPa;

[0026] Preferably, the top temperature of the second-effect distillation tower is 78-80°C, the bottom temperature is 80-82°C, and the absolute pressure of the second-effect distillation tower is 105-110 kPa;

[0027] Preferably, the top temperature of the first-effect distillation tower is 90-92°C, the bottom temperature is 98-100°C, and the absolute pressure of the first-effect distillation tower is 168-170 kPa;

[0028] Preferably, the top temperature of the evaporation recovery tower is 112-115°C, the bottom temperature is 143-145°C, and the absolute pressure of the evaporation recovery tower is 0.35-0.4MPa;

[0029] Preferably, during the adsorption and pressurization process of the adsorption equipment, the absolute pressure is 0.3-0.35 MPa, and the vacuum degree is -90 KPa during negative pressure analysis.

[0030] Beneficial effects of the present invention:

[0031] 1. The present invention adopts a five-effect thermal coupling process to achieve the reuse of heat and good energy-saving effect. The whole set of equipment consumes no more than 0.5 tons of steam for each ton of anhydrous alcohol produced.

[0032] 2. The present invention realizes the production of high-purity anhydrous alcohol by utilizing fuel ethanol, and has obvious economic benefits. The present invention is provided with a four-effect light-removing tower to remove low-boiling-point impurities such as methanol and aldehydes in the fuel ethanol; three distillation towers are provided to extract the alcohol in the fuel ethanol with light components removed from the first-effect, second-effect and third-effect distillation towers in sequence, and impurities such as fusel oil with higher boiling points are discharged from the kettle of the first-effect distillation tower; an evaporation recovery tower is provided to complete the vaporization of distilled alcohol and the recovery of light alcohol from one tower, and the feed is used as reflux, thereby saving steam consumption.

[0033] 3. The molecular sieve dehydration device uses three adsorbers, one for adsorption, one for pressurization, and one for analysis. The pressure fluctuation is very small during switching, thus ensuring the stable operation of the device. Compared with the dehydration process of two adsorbers, the operating pressure of the dehydration process of two adsorbers varies greatly, especially when the two adsorbers are in the process of equalizing the pressure, there is no output of anhydrous wine vapor, so the dehydration process of the two adsorbers cannot achieve thermal coupling.

[0034] 4. Use raw material preheater to recycle heat in finished high-purity anhydrous ethanol; use distilled alcohol preheater to recycle heat from steam condensation water; use light wine preheater to recycle heat from the bottom of evaporation recovery tower, and recycle waste heat from logistics of the discharge system, which saves both steam consumption and cooling water consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a flow chart of the present invention;

[0036] In the figure: 1. Raw material tank, 2. Four-effect light removal tower, 3. One-effect distillation tower, 4. Two-effect distillation tower, 5. Three-effect distillation tower, 6. Evaporation recovery tower, 7. Raw material preheater, 8. Light removal tower condenser, 9. First vacuum pump, 10. Wine head storage tank, 11. Light removal reboiler, 12. Distilled alcohol preheater, 13. Three-effect reboiler, 14. Two-effect reboiler, 15. Fusel oil collection tank, 16. Superheater, 17. One-effect reboiler, 18. Finished product cooler, 19. Analytical condenser, 20. Light wine preheater, 21. Second vacuum pump, 22. Molecular sieve adsorber A, 23. Molecular sieve adsorber B, 24. Molecular sieve adsorber C, 25. Wastewater treatment system, 26. Evaporation reboiler, 27. Condensate tank, 28. Boiler room. DETAILED DESCRIPTION

[0037] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0038] In order to enable those skilled in the art to more clearly understand the technical solution of the present application, the technical solution of the present application will be described in detail below in conjunction with specific embodiments.

[0039] A high-purity anhydrous alcohol production system of the present invention comprises a raw material tank 1, a four-effect lightness removal tower 2, a first-effect distillation tower 3, a second-effect distillation tower 4, a third-effect distillation tower 5, an adsorption device and an evaporation recovery tower 6.

[0040] Fuel ethanol with a water content of 0.5% is contained in a raw material tank 1, and the raw material tank 1 is connected to the middle inlet end of a four-effect de-lightening tower 2 through a pipeline via a raw material preheater 7, and the alcohol vapor outlet end of the top of the four-effect de-lightening tower 2 is connected to the inlet end of a de-lightening tower condenser 8 through a pipeline, and the outlet end of the de-lightening tower condenser 8 is respectively connected to the top inlet end of the four-effect de-lightening tower 2 and a head storage tank 10 through pipelines, and the de-lightening tower condenser 8 is also connected to a first vacuum pump 9 through a pipeline, and negative pressure is provided to the four-effect de-lightening tower 2 through the first vacuum pump 9.

[0041] The alcohol outlet at the bottom of the four-effect light-removing tower 2 is connected to the middle and lower inlet of the three-effect distillation tower 5 through a pipeline, and the alcohol vapor outlet at the top of the three-effect distillation tower 5 passes through the light-removing reboiler 11 through a pipeline, and is respectively connected to the top inlet of the evaporation recovery tower 6 through a pipeline through a distilled alcohol preheater 12, and is connected to the top inlet of the three-effect distillation tower 5 through a pipeline. The light-removing reboiler 11 forms a closed loop with the four-effect light-removing tower 2 through a pipeline.

[0042] The alcohol outlet at the bottom of the triple-effect distillation tower 5 is connected to the middle and lower inlet of the second-effect distillation tower 4 through a pipeline, and the alcohol vapor outlet at the top of the second-effect distillation tower 4 passes through the triple-effect reboiler 13 through a pipeline, and is respectively connected to the top inlet of the evaporation recovery tower 6 through a pipeline through a distilled alcohol preheater 12, and is connected to the top inlet of the second-effect distillation tower 4 through a pipeline. The triple-effect reboiler 13 forms a closed loop with the triple-effect distillation tower 5 through a pipeline.

[0043] The alcohol outlet at the bottom of the second-effect distillation tower 4 is connected to the middle and lower inlet of the first-effect distillation tower 3 through a pipeline, and the alcohol vapor outlet at the top of the first-effect distillation tower 3 passes through the second-effect reboiler 14 through a pipeline, and is respectively connected to the top inlet of the evaporation recovery tower 6 through a pipeline through a distilled alcohol preheater 12, and is connected to the top inlet of the first-effect distillation tower 3 through a pipeline. The second-effect reboiler 14 forms a closed loop with the second-effect distillation tower 4 through a pipeline. The bottom outlet of the first-effect distillation tower 3 is connected to the fusel oil collection tank 15 through a pipeline, and fusel oil is discharged from the bottom of the first-effect distillation tower 3.

[0044] The alcohol vapor outlet of the evaporation recovery tower 6 is connected to the inlet of the adsorption device through a pipeline through a heat exchanger 16, and the anhydrous alcohol vapor outlet of the adsorption device is connected to the finished product cooler 18 through a pipeline in sequence through a first-effect reboiler 17 and a raw material preheater 7. The high-purity anhydrous alcohol vapor generated by the adsorption device is condensed and supplied to the first-effect distillation tower 3 through the first-effect reboiler 17, and the raw material is preheated through the raw material preheater 7. The first-effect reboiler 17 forms a closed loop with the first-effect distillation tower 3 through a pipeline.

[0045] The analysis outlet end of the adsorption device is connected to the lower middle inlet end of the evaporation recovery tower 6 through a pipeline in sequence via the analysis condenser 19 and the light wine preheater 20. The analysis condenser 19 is connected to the second vacuum pump 21 through a pipeline, and the second vacuum pump 21 provides negative pressure for the analysis process of the adsorption device.

[0046] The adsorption equipment includes molecular sieve adsorber A 22, molecular sieve adsorber B 23 and molecular sieve adsorber C 24. The adsorber uses three molecular sieve adsorbers, one for adsorption, one for pressurization and one for analysis. The pressure fluctuation is very small during switching, thus ensuring the stable operation of the device.

[0047] The waste liquid outlet end at the bottom of the evaporation recovery tower 6 is connected to the wastewater treatment system 25 through a pipeline via a light alcohol preheater 20. The waste water from the bottom of the evaporation recovery tower 6 is preheated by the light alcohol preheater 20 to preheat the light alcohol.

[0048] The bottom of the evaporation recovery tower 6 forms a closed loop with the evaporation reboiler 26 through a pipeline, the inlet ends of the evaporation reboiler 26 and the superheater 16 are respectively connected to saturated steam through pipelines, and the outlet ends of the evaporation reboiler 26 and the superheater 16 are respectively connected to the boiler room 28 through pipelines in sequence through the condensate tank 27 and the distillation alcohol preheater 12. The distillation alcohol preheater 12 preheats the feed of the evaporation recovery tower 6 by steam condensate.

[0049] The method for producing high-purity anhydrous alcohol using the high-purity anhydrous alcohol production system comprises the following steps:

[0050] (1) The fuel ethanol raw material with a water content of 0.5% is first preheated to 60°C by a raw material preheater 7 and then enters the middle part of a four-effect de-lightening tower 2. The impurities such as low-boiling point methanol and aldehydes contained in the fuel ethanol are removed by a de-lightening tower. The alcohol vapor at the top of the de-lightening tower is condensed by a de-lightening tower condenser 8 and most of it is refluxed. A small amount of head is collected and enters a head storage tank 10;

[0051] The top temperature of the four-effect light removal tower 2 is 50-53°C, the bottom temperature is 56-59°C, and the absolute pressure of the four-effect light removal tower 2 is 32-36kpa;

[0052] (2) The alcohol from which low-boiling impurities have been removed enters the lower middle part of the triple-effect distillation tower 5 from the bottom of the quadruple-effect light-removal tower 2 for distillation. The alcohol vapor at the top of the triple-effect distillation tower 5 is condensed through the light-removal reboiler 11, and while condensing, it serves as a heat source for the quadruple-effect light-removal tower 2. A portion of the condensate flows back to the top of the triple-effect distillation tower 5, and a portion is extracted as distilled alcohol. At a higher reflux ratio, the fusel oil component in the raw material will not be brought into the top of the distillation tower, but will accumulate at the bottom of the tower.

[0053] The top temperature of the triple-effect distillation tower 5 is 65-68°C, the bottom temperature is 70-72°C, and the absolute pressure of the triple-effect distillation tower 5 is 62-66kpa;

[0054] (3) The alcohol at the bottom of the triple-effect distillation tower 5 enters the lower middle part of the second-effect distillation tower 4 for distillation. The alcohol vapor at the top of the second-effect distillation tower 4 is condensed by the triple-effect reboiler 13, and is used as a heat source for the triple-effect distillation tower 5 at the same time. A part of the condensate flows back to the top of the second-effect distillation tower 4, and a part is extracted as distilled alcohol.

[0055] The top temperature of the second-effect distillation tower 4 is 78-80°C, the bottom temperature is 80-82°C, and the absolute pressure of the second-effect distillation tower 4 is 105-110kpa;

[0056] (4) The alcohol at the bottom of the second-effect distillation tower 4 enters the lower middle part of the first-effect distillation tower 3 for distillation. The alcohol vapor at the top of the first-effect distillation tower 3 is condensed through the second-effect reboiler 14, and is used as a heat source for the second-effect distillation tower 4 during condensation. Part of the condensate flows back to the top of the first-effect distillation tower 3, and part of it is extracted as distilled alcohol, and fusel oil is discharged from the bottom of the first-effect distillation tower 3;

[0057] The top temperature of the first-effect distillation tower 3 is 90-92°C, the bottom temperature is 98-100°C, and the absolute pressure of the first-effect distillation tower 3 is 168-170kpa;

[0058] (5) The distilled alcohol extracted from the first-effect distillation tower 3, the second-effect distillation tower 4, and the third-effect distillation tower 5 is preheated to 115° C. in the distilled alcohol preheater 12 and then enters the evaporation recovery tower 6. It is then concentrated and vaporized together with the recovered light alcohol and then enters the superheater 16 for overheating. It is then dehydrated by an adsorption device. The dehydrated anhydrous alcohol vapor enters the first-effect reboiler 17 for condensation. The condensation also serves as the heat source of the first-effect distillation tower 3. The anhydrous ethanol obtained after condensation is preheated with the raw material and then cooled in the finished product cooler 18 to obtain a finished product of high-purity anhydrous ethanol.

[0059] The top temperature of the evaporation recovery tower 6 is 112-115°C, the bottom temperature is 143-145°C, and the absolute pressure of the evaporation recovery tower 6 is 0.35-0.4MPa;

[0060] (6) The adsorption device is subjected to negative pressure analysis, and the light alcohol vapor generated by the analysis enters the analysis condenser 19. The condensed light alcohol is preheated by the light alcohol preheater 20 and then enters the lower part of the first-effect evaporation recovery tower 6 for alcohol recovery.

[0061] During the adsorption and pressurization process of the adsorption equipment, the absolute pressure is 0.3-0.35MPa, and the vacuum degree is -90KPa during negative pressure analysis.

[0062] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A high-purity anhydrous alcohol production system, characterized in that: Including raw material tank, four-effect light removal tower, one-effect distillation tower, A two-effect distillation tower, a three-effect distillation tower, an adsorption device and an evaporation recovery tower; the raw material tank is connected to the middle inlet end of the four-effect light removal tower through a pipeline via a raw material preheater, the alcohol vapor outlet end at the top of the four-effect light removal tower is connected to the inlet end of the light removal tower condenser through a pipeline, the alcohol outlet end at the bottom of the four-effect light removal tower is connected to the middle and lower inlet end of the three-effect distillation tower through a pipeline, the alcohol vapor outlet end at the top of the three-effect distillation tower is condensed in a light removal reboiler through a pipeline, and then connected to the top inlet end of the three-effect distillation tower and the top inlet end of the evaporation recovery tower through pipelines respectively; three The alcohol outlet at the bottom of the first-effect distillation tower is connected to the middle-lower inlet of the second-effect distillation tower through a pipeline, and the alcohol vapor outlet at the top of the second-effect distillation tower passes through a third-effect reboiler through a pipeline, and is respectively connected to the top inlet of the second-effect distillation tower and the top inlet of the evaporation recovery tower through pipelines; the alcohol outlet at the bottom of the second-effect distillation tower is connected to the middle-lower inlet of the first-effect distillation tower through a pipeline, and the alcohol vapor outlet at the top of the first-effect distillation tower passes through a second-effect reboiler through a pipeline, and is respectively connected to the top inlet of the first-effect distillation tower and the top inlet of the evaporation recovery tower through pipelines; A rectified alcohol preheater is arranged at the top inlet of the evaporation recovery tower; the alcohol vapor outlet of the evaporation recovery tower is connected to the inlet of the adsorption device through a pipeline through the preheater, and the anhydrous alcohol vapor outlet of the adsorption device is connected to the finished product cooler through a pipeline in sequence through a first-effect reboiler and a raw material preheater; The light-removal reboiler forms a closed loop with the four-effect light-removal tower through a pipeline, the three-effect reboiler forms a closed loop with the three-effect distillation tower through a pipeline, the two-effect reboiler forms a closed loop with the two-effect distillation tower through a pipeline, and the one-effect reboiler forms a closed loop with the one-effect distillation tower through a pipeline; The analytical outlet of the adsorption device is connected to the lower inlet of the evaporation recovery tower through a pipeline in sequence via an analytical condenser and a light wine preheater, and the analytical condenser is connected to the second vacuum pump through a pipeline.

2. The high-purity anhydrous alcohol production system according to claim 1, characterized in that: Lightness removal tower condenser outlet The condenser of the light removal tower is connected to the inlet end of the tower top of the four-effect light removal tower and the head storage tank through pipelines. A vacuum pump is connected.

3. The high-purity anhydrous alcohol production system according to claim 1, characterized in that: Adsorption equipment including molecular sieve Adsorber A, molecular sieve adsorber B and molecular sieve adsorber C.

4. The high-purity anhydrous alcohol production system according to claim 1, characterized in that: Evaporation recovery tower bottom waste liquid The outlet end is connected to the wastewater treatment system through a pipeline via a light wine preheater.

5. The high-purity anhydrous alcohol production system according to claim 1, characterized in that: The bottom of the evaporation recovery tower passes The pipeline forms a closed loop with the evaporator-reboiler. The inlet ends of the evaporator-reboiler and superheater are connected to the saturated steam through pipelines. The outlet ends of the evaporator, reboiler and superheater are connected to the boiler room through pipelines in sequence via the condensate tank and the distilled alcohol preheater.

6. A method for producing high-purity anhydrous alcohol using the system according to any one of claims 1 to 5, characterized in that: Including Next steps: (1) The fuel ethanol raw material with a water content of 0.5% is first preheated to 60°C in a raw material preheater and then enters the middle of a four-effect de-lightening tower. The impurities such as low-boiling point methanol and aldehydes contained in the fuel ethanol are removed by a de-lightening tower. The top of the four-effect de-lightening tower is Most of the refined steam is refluxed after being condensed in the de-light tower condenser, and a small amount of wine head is taken out; (2) the alcohol from which low-boiling impurities have been removed enters the lower middle part of the triple-effect distillation tower from the bottom of the quadruple-effect light-removal tower for distillation, and the alcohol vapor at the top of the triple-effect distillation tower is condensed through a light-removal reboiler, and is used as a heat source for the quadruple-effect light-removal tower while being condensed. A portion of the condensate is refluxed to the top of the triple-effect distillation tower, and a portion is extracted as distilled alcohol; (3) The alcohol at the bottom of the three-effect distillation tower enters the lower middle part of the two-effect distillation tower for distillation. The alcohol vapor at the top of the two-effect distillation tower is condensed through a three-effect reboiler and used as a heat source for the three-effect distillation tower. Part of the condensate flows back to the top of the two-effect distillation tower, and part is extracted as distilled alcohol. (4) The alcohol at the bottom of the second-effect distillation tower enters the lower middle part of the first-effect distillation tower for distillation. The alcohol vapor at the top of the first-effect distillation tower is condensed through the second-effect reboiler and used as a heat source for the second-effect distillation tower. Part of the condensate flows back to the top of the first-effect distillation tower, and part is extracted as distilled alcohol. (5) The distilled alcohol extracted from the first-effect distillation tower, the second-effect distillation tower, and the third-effect distillation tower is preheated to 115° C. in a distilled alcohol preheater and then enters the top of the evaporation recovery tower. It is then concentrated and vaporized together with the recovered light alcohol and then enters the superheater for overheating. It is then dehydrated by an adsorption device. The dehydrated anhydrous alcohol vapor enters the first-effect reboiler for condensation. The condensation also serves as a heat source for the first-effect distillation tower. The anhydrous ethanol obtained after condensation is used to preheat the raw material and then cooled in a finished product cooler to obtain a finished product of high-purity anhydrous ethanol. (6) The adsorption equipment is subjected to negative pressure analysis, and the light alcohol vapor generated by the analysis enters the analysis condenser. The condensed light alcohol is preheated by the light alcohol preheater and then enters the lower part of the first-effect evaporation recovery tower for alcohol recovery.

7. The method according to claim 6, characterized in that: The top temperature of the four-effect light removal tower is 50-53°C, and the bottom temperature is The temperature is 56-59℃, and the absolute pressure of the four-effect light removal tower is 32-36kpa.

8. The method according to claim 6, characterized in that: The top temperature of the triple-effect distillation tower is 65-68°C, and the bottom temperature is The temperature is 70-72℃ and the absolute pressure of the triple-effect distillation tower is 62-66kpa.

Images